Administratrix  of



(No Model.) I

' T. S. BISHOP, Deod.

SA A. BISHOP, Administratrix. VALVE.

Patented Nov. 26, 1889.

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y a Y K5 (IIN er @Hr c; s, @y 1n y UNITED STATES .PATENT i THOMAS S. BISHOP, DECEASED.

VALVE.

SPECIFICATION forming part of Letters Patent No. 415,699,aatednoveniber'ee,Isso. f Application filed July 23, 1889. Serial No. 318,362. (No model.)

To all wtomt't may concern.-

Be it known that I, SARAH A. BISHOP, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, administratrix of the estate of THOMAS S. BISHOP, late a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, deceased, (as by reference to the duly Io certified copy of letters of administration hereto annexed will more full-y appear,) do hereby declare that THOMAS S. BISHOP invented a new and useful Improvementin Valves, of which the following is a specification.

This invention relates to improvements in valves; and it consists in certain novel features hereinafter described and claimed.

In the accompanying drawings, Figure l is 2o a sectional view of a valve provided with the improved devices. Fig. 2 is adetail sectional view showing the manner of securing the valves to the stem.

The shell A is of the usual construct-ion, 2 5 and is provided with an inlet-opening B, an outlet-opening C, and a diagonally-arranged partition D, having a central opening E. lVithin the opening E, I secure the bushing or ring F, having its inner edge beveled, so 3o as to form a valve-seat. The shell A is provided at one side with an opening G, and this openingis covered with a cap H, which is secured to the shell by means of bolts passed through the edge of the cap and the annular liange I of the shell. This cap is provided with a central opening J, through which the valve-stern passes, and on its inner side it is provided with the annular rib K, which is beveled to form a valve-seat, and on its outer side is provided with a chamber L, forming a stufling-box, which is closed by a gland M. I From one side of the cap projects a frame N, which is provided with a bearing O, and in the said bearing the valve-stem P is mounted, the said stern being threaded, so that it can be readily moved longitudinally in the said bearing. The valve-stem is provided with a hand-wheel Q at its outer end and' entends through the gland M and the central opening .I of the cap G. The inner end of the valvestem is provided with an annular enlargement R, and near the inner end I form on the valve stein the screw-threads S. A small valve T is secured rigidly on the valve-stem and is adapted to rest upon the valve-seat formed by the annular rib K. The said valve consists of a disk or circular plate and a nut or collar U, formed integral with said disk and internally threaded, so as to engage the screw-threads S and thereby secure the said 6c valve on said stem.

A valve V, of larger diameter than the valve T, is swiveled to the end of the valve-stem and is adapted to rest on the valve-seat formed by the bushing F. The said valve consists of a disk or circular plate W, a spindle or stem X, formed integral therewith and extending therefrom to the central opening in the partition D, and engaging suitable bearings in the guide Y, formed on said partition, and 7c a ring Z, formed integral with the disk and projecting therefrom past t-he end of the valve-stem and internally threaded. This ring Z is engaged by a collar a, adapted to slide on the valve-stem and turning up toward 7 5 the annular enlargement R, so as to secure the said valve V to the valve-stem.

By the use of a valve constructed in accordance with this invention a new supply of packing may be placed in the chamber L 8o without interfering with the operation of the valve. In operation the larger valve is opened or drawn from its seat by properly operating the valve-stem, and this operation will draw the smaller valve against its seat, so that it Will surround the base of the stuing-boX and prevent the steam escaping through the packing. The gland andthe packing can then be easily removed and fresh packing easily substituted. By this device the pack- 9o ing will last for a longer period of time than heretofore, as it is cut off from the action of the steam or other fluid passing through the valves, as will be readily understood. The construction of this valve is such that no ypacking is required in the interior of the valve casing or shell, and the passage therethrough is left almost entirely unobstructed. No broad claim is made in this application to a valve-stem carrying two valves, .as such Ioo devices have heretofore been provided. In` this device, however, an ordinary valve-stem can beA employed, and the construction of1 the valves isv such asI toY simplif y and eheapen the device.

Having described the invention, what is claimed, and desired to be secured by Letters Patent, is-

The combination, with theI shell having. an internal partition provided with the guide Y and the valve-seat F, and the cap H, having a valve-seat K On its inner side anda stuffing-box on its Outer side, of the valvej' stem passing through the cap and having the screw-threadsS, and provided at itsinner end with the annular enlargement R, the valve threads S, the said valve being adapted to restagainst thevalve-seat and the valve Y, having a ring,V Z en GiIIClng the annular en- .the www@ 0f" THOMAS .Sl BLSEQR- IY have hereuntoaiged my signature in presencel of witnesses.

, SARAH A. BISHOP, Admnfistmri of Thomas S. Bishop,

deceased.

Witnesses:

` JAMES PATTERSON,

GEO. C. NORRIs, JOHN C. THOMPSON. 

